This past week 19 new mashups were added to our mashup directory and 28 different APIs were used to build them. A couple of the newer or less frequently seen APIs include Microsoft adCenter and COLOURlovers. The most often used APIs this week are Box.net, Google Maps and Twitter. And the most commonly used types of APIs were Mapping (4 APIs, 11 mashups), Social (4 APIs, 10 mashups) and Advertising (3 APIs, 3 mashups). The list below shows which APIs were used by which mashups: